Question about BenQ FP567s 15" LCD Monitor

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Benq monitor model no V551

Monitor output transistor short again & again

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It is possible EHT is defective.

Posted on May 08, 2008

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My benq monitor worked for a couple of years then one day it just stopped. FP731 17". I get the green power light but nothing on the screen. Hooked up a different monitor to the computer and it works...


It is almost the same as DELL monitor (BenQ makes monitors for Dell and HP), so look for shorted transistors, cold solder joint, fuse.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed DELL monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Sep 12, 2010 | BenQ FP731 - 17" LCD Monitor

1 Answer

Screen is blank


Those models are made by BenQ. Their notariety is bad solder connections that cause the drive transistors to overheat. Sometimes it just blows fuse pf751(2 amp); other times it will damage a transistor or two (2sc5707 or 5706 x 4).
Be sure to resolder the output transformer leads.
Monitor Mike

Mar 16, 2009 | Dell UltraSharp E153FPb 15" LCD Flat Panel...

2 Answers

Benq 737s monitor black screen


BenQ LCDs are known for poor solder connections causing the inverter driver transistors to short.
Result is no backlight.
Monitor Mike

Jan 03, 2009 | BenQ FP737S-D 17" LCD Monitor

2 Answers

Benq lcd c5707 transistor issues


You need transistors with hfe greater than 300. They are harder to get and you should use the producter`s original transistors 2sa5707.

Oct 18, 2008 | BenQ FP71G 17" LCD Monitor

1 Answer

Found them


If you are referring to the C5707 inverter driver transistors, you can test them in circuit with an ohmmeter. Usually one pair will show shorted although only one may be actually shorted. Normal procedure is to replace the pair that shows in circuit short. If you do not resolder the transformer connections your transistors will short again.
Monitor Mike

May 30, 2008 | BenQ FP737S-D 17" LCD Monitor

1 Answer

Still no display


Is there a diode on the other side of the transistor? That could have gone as well (if my electronics repair hasn't failed me yet!!) That is just a stab in the dark. Sorry I couldn't be more help, but it has been quite a few years (15 at least!).

May 16, 2008 | BenQ FP737S-D 17" LCD Monitor

1 Answer

BenQ FP72G 17" LCD Monitor NO DISPLAY but when i shine a torch on the screen, it shows the display. Does anyone know exactly which compoent i need to replace on the Inverter board ? All transistors seems...


The parts list..Here we go again =)
  1. 4x 2SC5705 (can also be 706 as well)
  2. Bridge capacitors (near the transistors) - Replace
  3. Transformers (can be either 4 or 2 used) - Resolder
  4. Fuse link (Marked with prefix FBxxx top middle of the board) - Replace
  5. 2x Diodes (close to transistors, one for each pair.) - Test
Start with those and if you still have issues post back with a photo of your board from both sides.

Apr 21, 2008 | BenQ FP72G+ 17" LCD Monitor

1 Answer

Back light goes out after start up


You have BenQ syndrome.
Sounds strange I know, but the power supply in your monitor is a BenQ manufactured part.
The problem is in the inverter section of the power/inverter board.
There are 4 small transistors (marked C5707) 1 or possibly 2 of these will have shorted out. Using a multimeter find the shorted one, and replace both of that pair, even if only one is shorted out.
There could also be other underlying issues as well that caused the transistor to fail in the first place.

Mar 28, 2008 | Dell E172FP 17" LCD Flat Panel Monitor

1 Answer

Benq 17"Lcd monitor fault


Resolder the power transistors on inverter board and also check them.If display is not there at all some of this 4 transistors C5707 should be defective.Check associated fuse and Fet which drives the transistor.

Also check with Benq ,Normally offers three year warranty.

Samir

Mar 23, 2008 | BenQ FP737S-D 17" LCD Monitor

5 Answers

BenQ FP51g LCD monitor


Dear Friend:
There is a Switch transistor to power on -off the hi voltaje for lights. Check 15V from power source go to this transistor colector, Using soldering Iron, make a juntion between colector and emiter, to short 15V to Hi voltaje power. I´m fixing 10 monitor the same trouble. I will remove a liter transistor.
Late I will post here the driver transistor number, and the replace number transistor I will use.
Pictures , etc. Best Regard

Feb 16, 2008 | Proview PL713S 17" Flat Panel LCD Monitor

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